DLPC3430 datasheet(39/59 Pages) TI1

39 / 59 page

Current (mA)

100

200

300

400

500

600

700

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

D001

DLPC3430, DLPC3435

www.ti.com

DLPS038B – JULY 2014 – REVISED FEBRUARY 2016

Product Folder Links: DLPC3430 DLPC3435

Submit Documentation Feedback

Typical Application (continued)

9.2.1 Design Requirements

A Pico projector is created by using a DLP chipset comprised of DLP2010 (.2 WVGA) DMD, DLPC343x

controller and DLPA2000 PMIC/LED driver. The DLPC343x does the digital image processing, the DLPA2000

provides the needed analog functions for the projector, and DMD is the display device for producing the

projected image.

In addition to the three DLP chips in the chipset, other chips may be needed. At a minimum a flash part is

needed to store the software and firmware to control the DLPC343x.

The illumination light that is applied to the DMD is typically from red, green, and blue LEDs. These are often

contained in three separate packages, but sometimes more than one color of LED die may be in the same

package to reduce the overall size of the pico-projector.

For connecting the DLPC343x to the host processing for receiving images, parallel interface is used. I2C should

be connected to the host processor for sending commands to the DLPC3430.

The only power supplies needed external to the projector are the battery (SYSPWR) and a regulated 1.8-V

supply.

The entire pico-projector can be turned on and off by using a single signal called PROJ_ON. When PROJ_ON is

high, the projector turns on and begins displaying images. When PROJ_ON is set low, the projector turns off and

draws just microamps of current on SYSPWR. When PROJ_ON is set low, the 1.8V supply can continue to be

left at 1.8 V and used by other non-projector sections of the product. If PROJ_ON is low, the DLPA2000 will not

draw current on the 1.8-V supply.

9.2.2 Detailed Design Procedure

For connecting together the DLP2010 (.2 WVGA) DMD, DLPC343x controller and DLPA2000 PMIC/LED Driver

see the reference design schematic. When a circuit board layout is created from this schematic a very small

circuit board is possible. An example small board layout is included in the reference design data base. Follow the

layout guidelines to achieve a reliable projector.

The optical engine that has the LED packages and the DMD mounted to it is typically supplied by an optical

OEM who specializes in designing optics for DLP projectors.

9.2.3 Application Curve

As the LED currents that are driven time-sequentially through the red, green, and blue LEDs are increased, the

brightness of the projector increases. This increase is somewhat non-linear, and the curve for typical white

screen lumens changes with LED currents is shown in Figure 21. For the LED currents shown, it is assumed that

the same current amplitude is applied to the red, green, and blue LEDs.

SPACE

Figure 21. Luminance vs Current

DLPC3430 датащи(PDF) 39 Page - Texas Instruments

DLPC3430 датащи(HTML) 39 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

датащи скачать

ссылки URL